There are very very browser add-ons that I actually use on my computer. I guess at heart I just like to keep things simple and clean and not have to worry with updating and application issues. However, there is one that I do use all the time called Web of Trust.
Web of Trust is a program that runs as an add-on to your browser (whichever one you use!). Its job is to let you know if the website you are looking at is safe or not based on millions of user reviews.
It ranks sites from safe to hazardous with the red light-green light measurement. So, safe sites are green! The best thing about it is that if you search on a search engine (like Google) WOT will let you know via the color indicator circle which sites are potentially dangerous links. So they warn you before you are in danger of going to an untrusted site.
I use WOT on all my browser so that I know I am not putting my computer's safety at risk while I am surfing on the internet. It really is the best and easiest tools I have ever found. It is a free download, so go now and get it and never risk your safety to the internet!